<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let cate = {
            person:Symbol(),
            animal:Symbol()
        }
        function getCate(type){
            if ( type === cate.person ){
                console.log("人类");
            } 
            if ( type === cate.animal ){
                console.log("动物");
            }
        }
        getCate(cate.person);
    </script>
</body>
</html>